Conditional action at checkout on Extra Fields

Hi ledom, this feature is very interesting. I think the easiest way for user would be to have a trigger for extra field validation, but i must work on it to see if it's possible. For the moment, you can try to use "Rules Form support" in Rules package, adding event/conditions on checkout form validation.

If you want to validate a field only, you can also do this in a custom module with a form alter hook.
See this example: #888128: Validation for the extra fields

Corrected issue title.

Hi all,
in attachment you can find a patch (and a new file to add rename it to uc_extra_fields_pane.ca.inc) for 6.x-2.x dev version. The patch provide a simple integration with Conditional Action, adding two new triggers "Extra Fields: Checkout Form Validation" & "Extra Fields: Order Edit Form Validation". These functions get called during validation of the checkout and order edit forms. User can then add conditions/actions with the possibility to execute custom php code: submitted form values are passed as argument "$form" (the second --$form_state-- argument of original validation function).
I hope it can be useful.

I've tested the patch, but I don't see a reason why we should add this to Extra Fields Pane. With this patch, if you want to validate the form, you still need to know PHP in order to validate it. You even need to know PHP to set the conditions (except if you want to set the condition "Check the current date"). In that case I think you might as well add the validation rules in a custom module.

I haven't tested "Rules Form support", but it sounds like that would be a good alternative.

Opinions?